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62 lines
2.6 KiB
62 lines
2.6 KiB
#nullable enable |
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// Copyright (c) 2025 Daniel Grunwald |
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// |
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this |
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// software and associated documentation files (the "Software"), to deal in the Software |
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// without restriction, including without limitation the rights to use, copy, modify, merge, |
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons |
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// to whom the Software is furnished to do so, subject to the following conditions: |
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// |
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// The above copyright notice and this permission notice shall be included in all copies or |
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// substantial portions of the Software. |
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// |
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, |
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE |
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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// DEALINGS IN THE SOFTWARE. |
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using System.Diagnostics; |
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using ICSharpCode.Decompiler.CSharp; |
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namespace ICSharpCode.Decompiler.IL; |
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partial class IsInst |
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{ |
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internal override bool SatisfiesSlotRestrictionForInlining(int childIndex, ILInstruction newChild) |
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{ |
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Debug.Assert(childIndex == 0); |
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Debug.Assert(base.SatisfiesSlotRestrictionForInlining(childIndex, newChild)); |
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if (this.Type.IsReferenceType == true) |
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{ |
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return true; // reference-type isinst is always supported |
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} |
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if (SemanticHelper.IsPure(newChild.Flags)) |
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{ |
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return true; // emulated via "expr is T ? (T)expr : null" |
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} |
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else if (newChild is Box box && SemanticHelper.IsPure(box.Argument.Flags)) |
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{ |
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// Also emulated via "expr is T ? (T)expr : null". |
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// This duplicates the boxing side-effect, but that's harmless as one of the boxes is only |
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// used in the `expr is T` type test where the object identity can never be observed. |
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// This appears as part of C# pattern matching, inlining early makes those code patterns easier to detect. |
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return true; |
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} |
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if (this.Parent is UnboxAny unboxAny && ExpressionBuilder.IsUnboxAnyWithIsInst(unboxAny, this.Type)) |
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{ |
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return true; // supported pattern "expr as T?" |
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} |
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if (this.Parent != null && (this.Parent.MatchCompEqualsNull(out _) || this.Parent.MatchCompNotEqualsNull(out _))) |
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{ |
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return true; // supported pattern "expr is T" |
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} |
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if (this.Parent is Block { Kind: BlockKind.ControlFlow }) |
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{ |
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return true; // supported via StatementBuilder.VisitIsInst |
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} |
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return false; |
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} |
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} |